1. Not all, but most of the components of the products with UL marking attached should have the UL approval, especially some critical components or materials, such as:
a: the enclosure's material(plastics): should be UL QMFZ2, sometimes QMMY2 is needed.
b: internal wiring: should be UL AWM or UL wiring harnesses;
c: PWB: should be ZPMV2;
.......
and etc...
2. For the critical components, most of this kind of components, are decided by the UL engineer, and the UL engineer will tell you and show the information about the critical components in the FUS procedure, of course, if you are familiar with the related standards, then you also can discuss some issues with the UL engineer, cause sometimes, not all the UL engineers are correct.
3. Even if you say your components can fulfill the UL's requirements, but there is no UL approval for this kind of components, and finally this kind of components are controlled by UL and regarded as the critical components, then you must find another supplier which can provide the similar components with the UL approval.
4. Except UL, there is no any other agency which can issue the UL certificate, maybe some agencies say they can issue the certificate, at this time, I can tell you they are cheating, at most, they can do some tests which authorized by UL and also can issue some test reports, but not the UL certificates...作者: mdjljqmcy 时间: 2012-1-6 18:44
UL并不是强制的.作者: voculy 时间: 2012-1-6 18:44
UL是比较权威和认可率较高的认证公司，除了UL认证外还是有别的公司可以做美国认证的，如ITS就可以做ETL认证，在美国市场一样可以流通作者: suqaxs 时间: 2012-1-6 18:44
顶上去,别掉了作者: 蓝色妖姬 时间: 2012-1-6 18:44
我也想知道，如果客户没有指定要做UL还是ETL，而是在问必须做UL吗？
我该如何回答。作者: oahemr 时间: 2012-1-6 18:44
这要看你的客户认定哪个认证了，另ETL也是美国的相关认证，EST（Q64847206）与UL区别就在于服务，作为ETL的客户，您可以享受到量身定制的测试、检验和认证服务，快捷的运作周期和灵活的工作方式。我们正在创造与客户合作更紧密的工作方式，以便您的产品更快、更顺利、更高效地进入市场。作者: 04211 时间: 2012-1-6 18:44
UL虽然不是强制的.但你将产品卖到美国就一定要有认证.对于做什么样的认证如果你是做产品部件的,那肯定是要取决于你的客户.如果你是成品卖到美国,那么你就要考虑市场对于哪种认证的认可度更高.